First, I was told I needs new O2 sensors, because the P0135 read heater sensor, bank 1, sensor 1, and then also 300- random misfire.
Since then, I just cleaned the bank 1, sensor 1 with the sensor cleaner you can buy at oriellys. Cleaned my terminals, bought new spark plugs but haven't put them in yet. Now check engine light came on again but haven't done the code reader again yet. Plan to in the morning. Any ideas on what to start with from here?
What makes this problem better or worse?
When the heater is being used on defrost
How long has your 1998 Toyota Avalon had this problem?
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